for cbs "this morning saturday" chip reid, washington. >> and it's about 21 after the hour. here's martina brown from cbs atlanta with our first check of the weather this morning. >> let's talk about the weather. big changes on the way. really all across the nation. let's start with the northeast where they have an area of low pressure that will start to bring them and is already bringing them lake-effect snow down to the southeast. an area of high pressure around. there's sunshine but eventually they will cool down and already are starting to see that as well. off to the northwest we're talking about an area of low pressure there as well. so get ready for the big chill. it is already starting to happen. our 50s and 60s will turn into 30s and 40s. look for gusty northwest winds and lake-effect snow and all because of a front that's moving across the entire country and everybody is going to be a lot colder than they already are. that is a look at your national forecast. now here's a closer look at the weather for your weekend. >>> back to you. >> and coming up the fighting ir